Heatable Composite Vapor Barrier for Building Retrofitting
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Solution Overview
Problem
Existing composite materials used as vapor barriers in construction lack versatility and effectiveness in providing both vapor barrier and electrical conductivity, as well as thermal insulation, while also being prone to moisture absorption and thermal bridging.
Innovation Solution
A composite material comprising a high-tear-resistant first layer, such as polyamide/polypropylene fleece, and an electrically conductive second layer, which can also serve as a heater or radiation shield, with additional layers for enhanced moisture resistance and thermal insulation, joined through lamination or other processes, achieving a water vapor diffusion-equivalent air layer thickness greater than 0.1 m.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vapor barrier materials (plastic film, aluminum foil) are used, then vapor barrier effectiveness is achieved, but moisture absorption and thermal bridging occur
Solution Approach 1:
The patent employs a composite structure consisting of a vapor barrier layer (plastic film or aluminum foil) combined with a fiber mat layer. This composite material provides both vapor barrier effectiveness and resistance to moisture absorption and thermal bridging, as the fiber mat layer compensates for the deficiencies of the vapor barrier layer while maintaining its primary function.
2Reliability
If vapor barrier is attached to glass fiber mat, then airtightness is improved, but device complexity increases
Solution Approach 1:
The patent merges the vapor barrier layer and the fiber mat layer into a single composite material unit that is attached to the insulation layer. This integration simplifies the construction process by reducing the number of separate components and attachment steps, while maintaining the airtightness function through the combined structure.
3Ease of manufacture
If single-layer vapor barrier is used, then manufacturing simplicity is maintained, but functional versatility is limited
Solution Approach 1:
The composite material structure serves multiple functions simultaneously: the vapor barrier layer provides vapor barrier effectiveness, the fiber mat layer provides moisture absorption resistance and thermal bridge prevention, and the integrated structure provides airtightness. This multi-functional design eliminates the need for separate materials for each function while maintaining manufacturing simplicity through a unified composite structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite material effectively functions as a vapor retarder, electromagnetic shield, and low-energy heating system, preventing moisture accumulation and mold formation, while providing cost-effective and efficient thermal insulation and radiation protection, improving room climate and reducing energy consumption.
Implementation Method 1
the second layer is electrically conductive. The first layer serves as a functional layer and as a carrier layer that carries the electrically conductive second layer, with the second layer making the composite film heatable and/or shielding it from electromagnetic radiation.
Implementation Method 2
the second layer making the composite film heatable
Implementation Method 3
providing cost-effective and efficient thermal insulation and radiation protection
Implementation Method 4
a plastic film, for example made of polyethylene, with a thickness d=0.1 mm and a water vapor diffusion resistance number μ=100,000. The water vapor diffusion-equivalent air layer thickness s d is calculated according to s d = μ * d to s d = 10 m
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a composite material for use in the manufacture, modernization, refurbishment, or renovation of buildings, building components, or the like, wherein the composite material consists of a preferably flexible material and comprises at least a first layer and a second layer. According to the invention, the first layer exhibits high tear and tensile strength. The second layer is electrically conductive. The first layer serves as a functional layer and as a carrier layer supporting the electrically conductive second layer, the second layer making the composite film heatable and/or shielding against electromagnetic radiation.